Large battery negative electrode structure with power-off pressure relief function

Abstract

The utility model belongs to the technical field of cylindrical lithium ion batteries, particularly relates to a large battery negative electrode structure with a power-off pressure relief function, and provides the following scheme aiming at the problem that a large cylindrical lithium battery in the prior art has relatively large potential safety hazards: the large battery negative electrode structure comprises a CID, a steel shell, a negative electrode current collecting disc, an insulating sheet and a roll core, the CID is welded with the steel shell and the negative collector plate through laser; the CID is made of copper or iron; the steel shell is made of steel; the cathode current collecting plate is made of copper; the insulation sheet is made of PP (polypropylene), five second circular vent holes are formed in the insulation sheet, a CID power-off notch is formed in the hollow circular boss, five first circular vent holes are formed in the CID, and a steel shell pressure relief notch is formed in the bottom of the steel shell. Therefore, the purpose of improving the safety coefficient is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium ion cylindrical battery technical field especially relates to a big battery negative pole structure with power failure pressure relief function. BACKGROUND

[0002] In prior art, the support of the state to new energy industry, especially new energy automobile industry, makes the battery industry develop rapidly. In addition to the performance of the battery itself, safety is also a problem that each lithium battery manufacturer must face and think about.

[0003] In recent years, with the development of science and technology, large cylindrical lithium batteries are more and more applied in various industries. Large cylindrical lithium batteries have the advantages of low internal resistance, high rate charge and discharge, etc. However, they also have great safety hazards. Therefore, it is particularly important for single battery cell to have good power failure and pressure relief structure.

[0004] Therefore, the present application proposes a big battery negative pole structure with power failure pressure relief function to solve the above problems. UTILITY MODEL CONTENTS

[0005] The utility model aims at solving the shortcomings that large cylindrical lithium battery has great safety hazards in prior art, and proposes a big battery negative pole structure with power failure pressure relief function.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A big battery negative pole structure with power failure pressure relief function, comprising CID, steel shell, negative pole current collecting disc, insulating sheet and roll core, and the CID, the steel shell and the negative pole current collecting disc are connected by laser welding;

[0008] The material of the CID is copper or iron;

[0009] The material of the steel shell is steel;

[0010] The material of the negative pole current collecting disc is copper;

[0011] The material of the insulating sheet is PP, and five No. 2 circular air holes are arranged in the insulating sheet.

[0012] As a preferred scheme of the utility model, the hollow circular boss is provided with CID power failure notch.

[0013] As a preferred scheme of the utility model, the CID is provided with five No. 1 circular air holes.

[0014] As a preferred scheme of the utility model, the bottom of the steel shell is provided with steel shell pressure relief notch.

[0015] As a preferred scheme of the utility model, the negative current collecting disc is internally provided with five welding areas matched with the winding core and one hollow circular boss matched with the CID.

[0016] As a preferred scheme of the utility model, the CID and the insulating sheet are internally provided with a hollow circular boss. Beneficial effects

[0017] 1, the main role of the steel shell bottom notch position diameter is less than the minimum diameter of CID and shell bottom contact, is that the current path does not go through the shell bottom notch, thereby reducing the internal resistance;

[0018] 2, the main role of the CID with hollow circular boss is to support the winding core, prevent the boss from deforming, cause the boss to have insufficient space to reverse, thereby losing the power-off function;

[0019] 3, the main role of the hollow circular boss in the insulating sheet is to support the winding core, so that the weight is dispersed on the remaining plane of the CID center circular boss.

[0020] In the utility model: the structure of lithium ion cylindrical battery is optimized, the new power-off and pressure relief structure is increased, so as to achieve the purpose of improving the safety factor. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 It is the explosion drawing of the utility model;

[0022] Fig. 2 It is the structure sectional view of the utility model;

[0023] Fig. 3 It is the structure enlarged view of the A structure of the utility model.

[0024] In the drawing: 1, steel shell;2, CID;3, negative current collecting disc;4, insulating sheet;5, winding core;6, CID power-off notch;7, steel shell pressure relief notch. DETAILED DESCRIPTION

[0025] The technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. EMBODIMENT

[0026] Referring to Figs. 1-3 A large battery negative structure with power-off and pressure relief functions, comprising CID 2, steel shell 1, negative current collecting disc 3, insulating sheet 4 and winding core 5, and the CID 2 and the steel shell 1 and the negative current collecting disc 3 are welded by laser;

[0027] The material of the CID 2 is copper or iron;

[0028] The material of the steel shell 1 is steel;

[0029] The material of the negative current collector 3 is copper;

[0030] The material of the insulating sheet 4 is PP, and five second circular air holes are arranged in the insulating sheet 4, which are assembled with the air holes of the CID 2 and five welding areas of the negative current collector 3 corresponding to the welding areas of the winding core 5.

[0031] As a preferred scheme of the utility model, the hollow circular boss is internally provided with a CID power-off notch 6, which reverses and cuts off power when the battery reaches a certain pressure value.

[0032] As a preferred scheme of the utility model, the CID is internally provided with five first circular air holes, which are used for air conduction.

[0033] As a preferred scheme of the utility model, the steel shell 1 is internally provided with a steel shell pressure relief notch 7, and the diameter of the steel shell pressure relief notch 7 is smaller than the minimum diameter of the contact between the CID 2 and the shell bottom 1, which is used for explosion and pressure relief when the battery reaches a certain pressure value.

[0034] As a preferred scheme of the utility model, the negative current collector 3 is internally provided with five welding areas matched with the winding core 5 and one welding area matched with the hollow circular boss of the CID 2.

[0035] As a preferred scheme of the utility model, the CID 2 and the insulating sheet 4 are internally provided with hollow circular bosses.

[0036] The working principle of the utility model is as follows: firstly, the negative current collector 3 and the winding core 5 are laser welded, then the insulating sheet 4 and the negative current collector 3 are assembled, the negative current collector 3 and the CID 2 are laser welded, and finally the CID 2 and the steel shell 1 are laser welded, a double safety protection structure of power-off and pressure relief is adopted, compared with the single pressure relief large cylindrical battery on the market, the safety is improved, the positive electrode structure can be relatively simple because the explosion-proof structure is designed in the negative electrode, the space occupied by the positive electrode end structure is reduced, thereby the battery energy is improved, the diameter of the notch position of the shell bottom of the steel shell 1 is smaller than the minimum diameter of the contact between the CID 2 and the shell bottom 1, which is used for preventing the current path from passing through the notch position of the shell bottom, thereby reducing the internal resistance, the hollow circular boss of the CID 2 is used for supporting the winding core 5 and preventing the above-mentioned boss from deforming, so that the boss has enough space to reverse and loses the function of power-off, and the hollow circular boss in the middle of the insulating sheet 4 is used for supporting the winding core 5 and dispersing the weight on the remaining planes of the center circular boss of the CID 2.

[0037] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any skilled person in the art, according to the technical scheme and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A large battery negative electrode structure with power-off and voltage-relief function, characterized in that, include CID (2), steel shell (1), negative current collector (3), insulating sheet (4) and core (5), and CID (2) is laser welded to steel shell (1) and negative current collector (3); The CID(2) is made of copper or iron; The steel shell (1) is made of steel; The negative electrode current collector (3) is made of copper; The insulating sheet (4) is made of PP and has five circular ventilation holes of number two inside.

2. The large battery negative electrode structure with power-off and voltage-relief function according to claim 1, characterized in that, The hollow circular boss has a CID power-off marking (6).

3. The large battery negative electrode structure with power-off and voltage relief function according to claim 1, characterized in that, The CID (2) has five circular vent holes of number one.

4. The large battery negative electrode structure with power-off and voltage-relief function according to claim 1, characterized in that, The bottom of the steel shell (1) is provided with a steel shell pressure relief mark (7).

5. A large battery negative electrode structure with power-off and voltage-relief function according to claim 1, characterized in that, The negative electrode current collector (3) has five welding areas that cooperate with the core (5) and one hollow circular boss that cooperates with the CID (2).

6. The large battery negative electrode structure with power-off and voltage-relief function according to claim 1, characterized in that, Hollow circular bosses are provided inside both the CID (2) and the insulating sheet (4).

Images